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Originally Posted by Flybert
Dream240, don't respond to this thread anymore because it's obvious that you don't know what you are talking about.
3" makes more power on NA then 2.25". It's dyno proven. Alex chang did back to back dynos with both diameter exhausts on a KA. 2.4L KA's push a lot of exhaust and love 3" exhausts. Maybe you are used to driving hondas or other small displacement I4's and all your information comes from that camp but it has been proven that it doesn't apply to the KA.
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You're absolutely right. I guess I dont know what I'm talking about. I did some more research and from what I had learned waaaaay back in the day was referring to exhausts LARGER than 3" being more hurtfull to NA midrange power. I will delete my previous post to avoid future confusion. So well said sir....I concede the knowledge crown to you
As far as exhaust noise...I am running a 3 inch cat-back with silencer and it's crazy loud above 3000 rpms. So really noise will be your only concern.